What does O stand for?

What does O mean?

O	Of Miscellaneous » Unclassified
O	Out Community » Sports
O	Online Computing » Networking
O	Oxygen Academic & Science » Meteorology
O	Oxygen Academic & Science » Chemistry
O	Out Governmental » NASA
O	Office Governmental » FBI Files
O	Off Academic & Science » Electronics
O	October Miscellaneous » Months Abbreviations
O	Object Computing » General
O	Operating Academic & Science » Electronics
O	Organization Business » General
O	Output Academic & Science » Electronics
O	Opportunities Business » Positions
O	Output Computing » Software
O	Opening Medical » Physiology
O	Ohio Regional
O	Officer Governmental » Military
O	Operations Business » General
O	Observation Medical » Physiology
O	Observed Miscellaneous » Food
O	Output Computing » Networking
O	Outdoor Community » Sports
O	Opportunity Business » General
O	Operator Computing » Telecom